Logo (Main page)
Special Astrophysical Observatory RAS

Russian
   About us      Divisions     Telescopes     Science     Publications     Education     Targeted training     Service     Contacts  

Scientific achievements, Galaxy sector

 2016: 


Termination of temperature increase in the supergiant V1302 Aql (IRC+10420) at the border of the Yellow void detected for the first time
In 1992-2014 at the 6-m SAO RAS telescope with the NES spectrograph, we conducted high-resolution spectroscopy of the yellow hypergiant V1302 Aql, the effective temperature of which was rapidly increasing during the 20th century with a rate of 120 K per year. Observations in 2001-2014 resulted in the conclusion that the hypergiant entered the phase of temperature rise termination and, in the Hertzsprung-Russel diagram, it resides near the Yellow void boundary.
Authors: Klochkova V.G., Chentsov E.L., Panchuk V.E., Yushkin M.V. (SAO RAS) in collaboration with Miroshnichenko A.S. (University of North Carolina at Greensboro, Greensboro, USA)
Published:
V.G.Klochkova, E.L.Chentsov, A.S.Miroshnichenko, V.E.Panchuk, M.V.Yushkin, High-resolution optical spectroscopy of the yellow hypergiant V1302 Aql (=IRC+10420) in 2001-2014, 2016, MNRAS, v.459, pp.4183-4190


Measurement of the diameter and detection of the component for the giant lambda Aquarii
In the course of observations with the lunar coverage method at the 6-m SAO RAS telescope, the authors measured the diameter of the nearby (plx = 8.47 mas) M giant lambda Aquarii in the pseudo-continuum region. The angular diameter is 7.11 ± 0.02 mas and the linear - 90 Solar radii. The authors for the first time detected a weak component of this star at a distance of 0.526 arcsec. The conducted speckle interferometric observations allowed the authors to classify the component as a F5 type of the Main Sequence and to obtain accurate positional parameters of this system. The work fulfilled shows the advantages of combining the methods of high spatial resolution astronomy in measuring fundamental parameters of stars.
Authors: Dyachenko V.V., Balega Yu.Yu., Beskakotov A.S., Maksimov A.F., Rastegaev D.A. (SAO RAS), Richichi A. (National Astronomical Research Institute of Thailand)
Published:
Dyachenko V., Richichi A., Balega Y., Beskakotov A., Maksimov A., Rastegaev D., Lunar occultation and speckle interferomerty of lambda Aquarii with the SAO RAS 6-meter telescope, 2016, Stars: from collapse to collapse: Proc. Conf. held at Spec. Astrophys. Observatory, Nizhny Arkhyz, Russia, 3-7 Oct. 2016, ASP Conf. Ser.


Registration of a predicted giant radio flare of the microquasar Cygnus X-3
September 13, 2016 at the RATAN-600 radio telescope, a rare event was detected in the microquasar Cygnus X-3 - a strong synchrotron flare with the flow growth from 0.01 to 15 Jy at 4.6 GHz during four days. Two weeks prior to this, the authors predicted a flare based on the following criterion: a flare will surely take place after the system passes to an "ultrasoft" X-ray state, namely, after disappearing and then appearing of a hot corona around the disk which consists of matter falling from the second Wolf-Rayet star onto the black hole. Interaction of different kinds of radiation from the microquasar is not accidental but is subject to the laws found and, therefore, is predictable.
Authors: Trushkin S.A., Nizhelskij N.A., Tsybulev P.G., Zhekanis G.V. (SAO RAS)
Published:
1. Trushkin S.A., Nizhelskij N.A., Tsybulev P.G., Zhekanis G.V. 2016. The predicted giant flare of Cyg X-3 occurs. The Astronomer's Telegram 9501 .
2. Trushkin S.A., Nizhelskij N.A., Tsybulev P.G., Zhekanis G.V. 2016. The beginning of a giant radio flare from Cygnus X-3. The Astronomer's Telegram 9444 .
3. Trushkin S.A., Nizhelskij N.A., Tsybulev P.G., Zhekanis G.V. 2016. A new state of quenched radio emission from microquasar Cyg X-3. The Astronomer's Telegram 9416 .
4. Trushkin S.A., Nizhelskij N.A., Tsybulev P.G., Zhekanis G.V., The giant radio flare of Cyg X-3 in September 2016, 2016, Stars: from collapse to collapse: Proc. Conf. held at Spec. Astrophys. Observatory, Nizhny Arkhyz, Russia, 3-7 Oct. 2016, ASP Conf. Ser.


  Back to previous page Archive


Any questions to  webmaster 
Last update: 10/01/2017